Knife blade



FIG. 1 is a perspective view of a knife blade showing my new design;

FIG. 2 is a left side elevational view thereof; and,

FIG. 3 is a right side elevational view thereof, the top plan, bottom plan, front elevational and rear elevational views being devoid of ornamentation.

The broken lines in the figures indicate environmental structure and define the bounds of the claimed design, and form no part thereof. 

The ornamental design for a knife blade, as shown and described. 